ksqlDB should optimize pull queries for streams for time ranges

[abraham-leal]

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Currently, ksqlDB causes a full topic scan whenever performing a pull query over a stream. This is inefficient when looking up specific sets of data, but necessary due to how pull queries are implemented over streams.

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Ideally, ksqlDB should be able to perform optimizations on the pull query to make it more performant according to a defined time range of the query. For example:

-- Should only scan from 1654618081 
SELECT * FROM STREAM WHERE ROWTIME > 1654618081;

-- Should only scan between 1654618081 and 1654618080
SELECT * FROM STREAM WHERE ROWTIME < 1654618081 AND ROWTIME > 1654618080 ;

-- Should only scan to 1654618081
SELECT * FROM STREAM WHERE ROWTIME < 1654618081;

This should be possible given Kafka allows to seek to an offset according to their timestamp (this optimization may not be possible with user-defined custom ROWTIMEs).

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No real alternative here.

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[sujayopensource]

Hi @agavra ,
Im a newbie interested in KSQL and would like to work on it.
Shall I assign it to myself?
Thanks.